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network: dhcp4: fix another race with SendDecline=yes 

If the SD_IPV4ACD_EVENT_BIND event happens before all routes are
assigned, then the link stuck in configuring state.
This commit is contained in:
Yu Watanabe 2020-07-16 10:31:49 +09:00
parent 75be72d139
commit 153cf04139
2 changed files with 66 additions and 41 deletions
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106
src/network/networkd-dhcp4.c
View File

@ -52,12 +52,16 @@ static void dhcp4_release_old_lease(Link *link) {
}
static void dhcp4_check_ready(Link *link) {
if (link->dhcp4_messages == 0) {
link->dhcp4_configured = true;
/* New address and routes are configured now. Let's release old lease. */
dhcp4_release_old_lease(link);
link_check_ready(link);
}
if (link->network->dhcp_send_decline && !link->dhcp4_address_bind)
return;
if (link->dhcp4_messages > 0)
return;
link->dhcp4_configured = true;
/* New address and routes are configured now. Let's release old lease. */
dhcp4_release_old_lease(link);
link_check_ready(link);
}
static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
@ -86,20 +90,18 @@ static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *li
return 1;
}
if (link->dhcp4_messages == 0) {
if (link->dhcp4_route_failed) {
link->dhcp4_route_failed = false;
link->dhcp4_route_retrying = true;
if (link->dhcp4_messages == 0 && link->dhcp4_route_failed) {
link->dhcp4_route_failed = false;
link->dhcp4_route_retrying = true;
r = dhcp4_remove_all(link);
if (r < 0)
link_enter_failed(link);
return 1;
}
if (!link->network->dhcp_send_decline)
dhcp4_check_ready(link);
r = dhcp4_remove_all(link);
if (r < 0)
link_enter_failed(link);
return 1;
}
dhcp4_check_ready(link);
return 1;
}
@ -836,6 +838,7 @@ static void dhcp_address_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
(void) in_addr_to_string(AF_INET, &address, &pretty);
log_link_debug(link, "Successfully claimed DHCP4 address %s", strna(pretty));
}
link->dhcp4_address_bind = true;
dhcp4_check_ready(link);
break;
@ -886,6 +889,44 @@ static int configure_dhcpv4_duplicate_address_detection(Link *link) {
return 0;
}
static int dhcp4_start_acd(Link *link) {
union in_addr_union addr;
int r;
if (!link->network->dhcp_send_decline)
return 0;
if (!link->dhcp_lease)
return 0;
link->dhcp4_address_bind = false;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr.in);
if (r < 0)
return r;
r = sd_ipv4acd_set_address(link->network->dhcp_acd, &addr.in);
if (r < 0)
return r;
r = sd_ipv4acd_set_callback(link->network->dhcp_acd, dhcp_address_on_acd, link);
if (r < 0)
return r;
if (DEBUG_LOGGING) {
_cleanup_free_ char *pretty = NULL;
(void) in_addr_to_string(AF_INET, &addr, &pretty);
log_link_debug(link, "Starting IPv4ACD client. Probing DHCPv4 address %s", strna(pretty));
}
r = sd_ipv4acd_start(link->network->dhcp_acd, true);
if (r < 0)
return r;
return 1;
}
static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
@ -915,31 +956,14 @@ static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *
return 1;
}
if (link->network->dhcp_send_decline) {
union in_addr_union addr;
r = dhcp4_start_acd(link);
if (r < 0) {
log_link_error_errno(link, r, "Failed to start IPv4ACD for DHCP4 adddress: %m");
link_enter_failed(link);
return 1;
}
(void) sd_dhcp_lease_get_address(link->dhcp_lease, &addr.in);
r = sd_ipv4acd_set_address(link->network->dhcp_acd, &addr.in);
if (r < 0)
return r;
r = sd_ipv4acd_set_callback(link->network->dhcp_acd, dhcp_address_on_acd, link);
if (r < 0)
return r;
if (DEBUG_LOGGING) {
_cleanup_free_ char *pretty = NULL;
(void) in_addr_to_string(AF_INET, &addr, &pretty);
log_link_debug(link, "Starting IPv4ACD client. Probing DHCPv4 address %s", strna(pretty));
}
r = sd_ipv4acd_start(link->network->dhcp_acd, true);
if (r < 0)
log_link_warning_errno(link, r, "Failed to start IPv4ACD client, ignoring: %m");
} else
dhcp4_check_ready(link);
dhcp4_check_ready(link);
return 1;
}

1
src/network/networkd-link.h
View File

@ -108,6 +108,7 @@ typedef struct Link {
bool dhcp4_route_failed:1;
bool dhcp4_route_retrying:1;
bool dhcp4_configured:1;
bool dhcp4_address_bind:1;
bool dhcp6_address_configured:1;
bool dhcp6_route_configured:1;
bool dhcp6_pd_address_configured:1;